Overcurrent protection method, overcurrent protection circuit, and display device

Abstract

This application discloses an overcurrent protection method, an overcurrent protection circuit, and a display device. The overcurrent protection method includes: setting an overcurrent protection value as an overcurrent protection threshold of a current clock signal branch; enabling the overcurrent protection threshold, and controlling to turn off a level shifting circuit; detecting a real-time current of a current clock signal branch in a first substrate row driving circuit; and comparing the real-time current with the overcurrent protection threshold, and when the real-time current is greater than or equal to the overcurrent protection threshold, cutting off a power supply of the current clock signal branch in the first substrate row driving circuit, and enabling overcurrent protection.

What is claimed is: 
     
       1. An overcurrent protection method, comprising steps of:
 detecting a real-time current of a current clock signal branch in a first substrate row driving circuit; 
 outputting a corresponding overcurrent protection value to a level shifting circuit according to the real-time current; 
 setting the overcurrent protection value as an overcurrent protection threshold of the current clock signal branch; 
 enabling the overcurrent protection threshold, and controlling to turn off the level shifting circuit; 
 detecting the real-time current of the current clock signal branch in the first substrate row driving circuit; and 
 comparing the real-time current with the overcurrent protection threshold, and when the real-time current is greater than or equal to the overcurrent protection threshold, cutting off a power supply of the current clock signal branch in a first substrate row driving circuit, and enabling overcurrent protection. 
 
     
     
       2. The overcurrent protection method according to  claim 1 , wherein the step of outputting a corresponding overcurrent protection value to a level shifting circuit according to the real-time current comprises:
 finding the corresponding overcurrent protection value from an overcurrent protection value lookup table according to a current slope waveform of the real-time current, and outputting the corresponding overcurrent protection value to the level shifting circuit. 
 
     
     
       3. The overcurrent protection method according to  claim 2 , wherein the overcurrent protection value lookup table is stored in a power supply chip, the overcurrent protection value lookup table comprises at least two groups of corresponding data of a current slope value of the current slope waveform and the overcurrent protection threshold. 
     
     
       4. The overcurrent protection method according to  claim 3 , wherein the overcurrent protection value in the overcurrent protection value lookup table corresponds to a peak of a real-time current slope waveform. 
     
     
       5. The overcurrent protection method according to  claim 2 , wherein the overcurrent protection value in the overcurrent protection value lookup table corresponds to a slope value of a real-time current slope waveform. 
     
     
       6. The overcurrent protection method according to  claim 1 , wherein the step of comparing the real-time current with the overcurrent protection threshold, and when the real-time current is greater than or equal to the overcurrent protection threshold, cutting off a power supply of the current clock signal branch in the first substrate row driving circuit, and enabling overcurrent protection comprises:
 comparing the current slope value of a real-time current slope waveform with the overcurrent protection threshold when the level shifting circuit is turned off, and when the current slope value of the real-time current is greater than or equal to the corresponding overcurrent protection threshold, cutting off the power supply of the current clock signal branch in the first substrate row driving circuit, and enabling circuit protection. 
 
     
     
       7. The overcurrent protection method according to  claim 1 , wherein the step of enabling the overcurrent protection threshold, and controlling to turn off the level shifting circuit comprises:
 determining whether an overcurrent protection threshold has been set for all clock signal branches in the first substrate row driving circuit, and if the overcurrent protection threshold has been set for all the clock signal branches in the first substrate row driving circuit, controlling to turn off the level shifting circuit. 
 
     
     
       8. The overcurrent protection method according to  claim 7 , wherein the step of enabling the overcurrent protection threshold, and controlling to turn off the level shifting circuit comprises:
 determining whether the overcurrent protection threshold has been set for all clock signal branches in the first substrate row driving circuit, and if the overcurrent protection threshold has not been set for all the clock signal branches in the first substrate row driving circuit, continuing an operation of setting the overcurrent protection threshold. 
 
     
     
       9. The overcurrent protection method according to  claim 8 , wherein after the step of enabling the overcurrent protection threshold, and controlling to turn off the level shifting circuit, the method further comprises a step of:
 redetecting the real-time current of the current clock signal branch in the first substrate row driving circuit when detecting that the level shifting circuit is restarted. 
 
     
     
       10. The overcurrent protection method according to  claim 9 , wherein after the step of redetecting the real-time current of the current clock signal branch in the first substrate row driving circuit when detecting that the level shifting circuit is restarted, the method further comprises a step of:
 outputting the corresponding overcurrent protection value to the level shifting circuit according to the detected real-time current. 
 
     
     
       11. The overcurrent protection method according to  claim 10 , wherein after the step of outputting the corresponding overcurrent protection value to the level shifting circuit according to the detected real-time current, the method further comprises a step of:
 setting the overcurrent protection value as the overcurrent protection threshold of the current clock signal branch by the level shifting circuit. 
 
     
     
       12. The overcurrent protection method according to  claim 11 , wherein after the step of setting, by the level shifting circuit, the overcurrent protection value as the overcurrent protection threshold of the current clock signal branch, the method further comprises a step of:
 controlling to turn off the level shifting circuit again. 
 
     
     
       13. The overcurrent protection method according to  claim 12 , wherein the step of controlling to turn off the level shifting circuit again comprises:
 determining whether the overcurrent protection threshold has been set for all the clock signal branches in the first substrate row driving circuit, and if the overcurrent protection threshold has been set for all the clock signal branches in the first substrate row driving circuit, controlling to turn off the level shifting circuit again. 
 
     
     
       14. The overcurrent protection method according to  claim 12 , wherein the step of controlling to turn off the level shifting circuit again comprises:
 determining whether the overcurrent protection threshold has been set for all clock signal branches in the first substrate row driving circuit, and if the overcurrent protection threshold has not been set for all the clock signal branches in the first substrate row driving circuit, continuing an operation of setting the overcurrent protection threshold. 
 
     
     
       15. The overcurrent protection method according to  claim 1 , wherein in the step of enabling the overcurrent protection threshold, and controlling to turn off the level shifting circuit,
 the level shifting circuit is turned off completely and no longer restarted.